Sculptor Eva who pioneered postminimalism in the 1960s (5)

I believe the answer is:

hesse

(Other definitions for hesse that I've seen before include "Nobel winner" , "Ger. state; Hermann ---, novelist" , "German state, capital Wiesbaden" , "German state, capital Weisbaden" , "poet" .)

I've seen this clue in the LA Times.

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